Re: Lumbar Spine Disorder
The left L5 nerve (from the L5-S1 level) is being "moderately" compromised by a herniated disk as it exits the spinal canal. "Moderate" is standard radiologist-speak for "possibly problematic", but it's still one step below "severe".
At L4-L5 there's a broader disk protrusion (but apparently not a herniation) that is affecting BOTH nerve roots (left and right). The radiologist doesn't supply an adjective for the nerve root impingement at this level, so one might guess that he doesn't think it's a big deal. He does say the thecal sac compression achieves "moderate" status, but I don't think that's as great a concern in the lumbar spine as it would be in the cervical.
Just based on the MRI report, I doubt that anyone would recommend surgery right now, unless they really wanted to do the surgery themselves, for their own reasons. I would expect that a determined effort at physical therapy and self-therapy exercises would be tried first.
If you haven't already, you might want to duplicate your post on the Back Problems board, as there is more lumbar expertise over there.